<?php
require_once 'conexao.php';
?>

<form action="#" method="post">
	Cliente:
	<select name="cliente">
		<option>Selecione
		<?php 
		$sql = mysql_query("SELECT * FROM tb_cliente");
		while ($row = mysql_fetch_array($sql)){
			echo '<option value='.$row['id'].'>'.utf8_encode($row['nome']).' '.utf8_encode($row['sobrenome']);
		}
		?>
	</select>
	<input type="submit" value="Salvar">
</form>